No idea what it's called.......there's a local charity nearby that may do things like this. Bought a long handled bulb planter from them in the past. They sell and repair old donated tools but they also sell them

The difference between a crome and a right angled fork is that with the crome it is the tines that are bent whereas the fork is set onto the handle at right angles - and I understand that is what defines a crome, whether it has two, three or four tines. When I was a child in Suffolk these were still being used for their original purpose on the next door farm as they still had working horses, and I'm sure that many East Anglian farms still have a few in a shed somewhere.

The 4-tine tiller on the Blackberry Lane site is also different from the crome as it is the haft of the tiller that is bent rather than the tines as with the crome.

Going off on a slight tangent, the name 'crome' refers to it being 'bent' and may well share it's origin with the word 'chrone' used to describe a 'bent old woman'. Indeed it is thought possible that the Norfolk painter John Crome http://www.bbc.co.uk/arts/yourpaintings/artists/john-crome may well have had an ancestor with scoliosis of the spine, giving rise to the family name.

Of course, in Norfolk and Suffolk it is not pronounced with a round 'o' as in home, but the 'o' is sounded a bit more like the 'u' in push.

I would scour the internet for Farm Deadstock sales and similar - you might pick up a second-hand one at a place like that.